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Altera_Forum's avatar
Altera_Forum
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16 years ago

Help requested with FIR/IIR filters please

Hi, I am presently using the FIR filter ip wizard in my project and have found that I am using a lot of resources and power to acheive my requirements. I have been told that IIR filters are mu...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
16 years ago

i'm not sure you'll get an IIR up to 200 MHz in a CIII, unfortunately.

a down sampling FIR won't meet your requirements? 200 MHz / 50 kHz = 400, you can build a 400 tap filter with 1 multiplier (assuming signed 18x18-bit multiplication), or 800 taps with 2 multipliers.

you could also try a CIC filter which is commonly used in cases with very large changes in sample rate.